Chemistry concepts and calculations

1. A 16.6g sample of sodium bicarbonate (NaHCO3) is decomposed by heating. How m

1. A 16.6g sample of sodium bicarbonate (NaHCO3) is decomposed by heating. How many grams of Na2CO3 remains? a. How many combined grams of CO2 and H2O in question 1? 2.. A 4.832g …

1. A 160 L kiln is used for vutrifying ceramics. It is currently operating at 11

1. A 160 L kiln is used for vutrifying ceramics. It is currently operating at 1145 degrees Celsius and the pressure is 1.100 atm. How many miles of air molecules are within the co…

1. A 18.0 L gas cylinder is filled with 9.80 moles of gas. The tank is stored at

1. A 18.0 L gas cylinder is filled with 9.80 moles of gas. The tank is stored at 25 C . What is the pressure in the tank? Express your answer to three significant figures and incl…

1. A 2-mol sample of potassium chlorate decomposes to form potassium chloride an

1. A 2-mol sample of potassium chlorate decomposes to form potassium chloride and oxygen gas. The reaction was accomplished with release of 78.0 kJ heat. Write a balanced thermoch…

1. A 2.000 grams of a salt are dissolved in enough water to make a solution with

1. A 2.000 grams of a salt are dissolved in enough water to make a solution with a volume of 250.0 mL The solution is titrated with a 0.1111 M sodium hydroxide solution and reache…

1. A 2.D 3.C 4.E through F 5. B 6. E through B 7.B through F Question pH for a s

1. A 2.D 3.C 4.E through F 5. B 6. E through B 7.B through F Question pH for a solution of a weak acid pH for a buffer with equal concentrations of a weak acid and the salt of the…

1. A 20 L cylinder containing helium gas at a pressure of 29.5 atm is used to fi

1. A 20 L cylinder containing helium gas at a pressure of 29.5 atm is used to fill a weather balloon in order to lift equipment into the stratosphere. To what maximum pressure (in…

1. A 20.0 ml sample of hydrofluoric acid ( ka= 7.1 x 10^-4 ) is titrated to equi

1. A 20.0 ml sample of hydrofluoric acid ( ka= 7.1 x 10^-4 ) is titrated to equivalence with 37.12 ml of 0.1211 M NaOH. What is the pH of the resulting solution 2. What is the sol…

1. A 220. L kiln is used for vitrifying ceramics. It is currently operating at 1

1. A 220. L kiln is used for vitrifying ceramics. It is currently operating at 1175 C , and the pressure is 1.100 atm . How many moles of air molecules are within the confines of …

1. A 25g ice cube, when left outside on a summer day, will spontaneously melt. D

1. A 25g ice cube, when left outside on a summer day, will spontaneously melt.  During this process, the temperatures of both the ice cube (0oC) and the surroundings (30oC) remain…

1. A 29.3 mL sample of 0.369 M ethylamine , C 2 H 5 NH 2 , is titrated with 0.20

1. A 29.3 mL sample of 0.369 M ethylamine, C2H5NH2, is titrated with 0.205 M hydrochloric acid. After adding 74.4 mL of hydrochloric acid, the pH is: 2. A 26.4 mL sample of 0.296 …

1. A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured

1. A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured at 18.0 C is 1.95 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask? E…

1. A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured

1. A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured at 18.0 C is 1.95 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask? E…

1. A 3.285-g sample of an oxide of Ru contains 2.655 g Ru. What is the empirical

1. A 3.285-g sample of an oxide of Ru contains 2.655 g Ru. What is the empirical formula of the oxide? 2. What is the empirical formula of a hydrocarbon if complete combustion or …

1. A 3.58-microF capacitor is charged by being connected across a 12.0-V battery

1. A 3.58-microF capacitor is charged by being connected across a 12.0-V battery.(a) Find the charge on the capacitor. (b) Find the potential energy of the charged capacitor. *Cor…

1. A 334 mL cylinder contains 5.225 g of Helium at 23 °C. How many grams of He m

1. A 334 mL cylinder contains 5.225 g of Helium at 23 °C. How many grams of He must be released to reduce the pressure to 75 atm? (Show all work.) 2. Place the following gases in …

1. A 34.32 mL sample of O 2 gas was collected over water at 24 o C from the deco

1. A 34.32 mL sample of O2 gas was collected over water at 24 oC from the decomposition of hydrogen peroxide. The barometric pressure in the room that day was 746.32 torr. A. Calc…

1. A 386 g sample of water absorbs infrared radiation at 1.06 x 10^4 nm from a c

1. A 386 g sample of water absorbs infrared radiation at 1.06 x 10^4 nm from a carbon dioxide laser. Suppose 45.0% of the absorbed radiation is converted to heat. Calculate the nu…

1. A 4 C charge moving horizontally through a 0.2 T magnetic field that points v

1. A 4 C charge moving horizontally through a 0.2 T magnetic field that points vertically downward experiences a magnetic force of 80 N pushing it horizontally toward the southwes…

1. A 4.27g sample of a laboratory solution contains 1.45g of acid. What is the c

1. A 4.27g sample of a laboratory solution contains 1.45g of acid. What is the concentration of the solution as a mass percentage? The figure below is a heat curve for an unknown …

1. A 4.2g sample of CaCO3 is added to 170.2g of 1.0M HCI. The temperature rises

1. A 4.2g sample of CaCO3 is added to 170.2g of 1.0M HCI. The temperature rises from 24.0 to 26.0 Assuming that the specific heat capacity, s, of the solution is 4.18 J/(gx oC) an…

1. A 46.2-mL sample of gas in a cylinder is warmed from 27 ?C to 83 ?C.What is i

1. A 46.2-mL sample of gas in a cylinder is warmed from 27 ?C to 83 ?C.What is its volume at the final temperature? (Assume constant pressure.) 2. The hydrogen gas formed in a che…

1. A 48.0g sample of an unknown metal at 99°C was placed in a constant-pressure

1. A 48.0g sample of an unknown metal at 99°C was placed in a constant-pressure calorimeter containing 70.0 g of water at 24.0°C. The final temperature of the system was found to …

1. A 5.25g sample of magnesium sulfate hydrate is heated until the masses stabil

1. A 5.25g sample of magnesium sulfate hydrate is heated until the masses stabilize. If the residue has a mass of 2.56g, answer the following. Show your formula and then how your …

1. A 5.75 mL sample of mercury has a measured mass of 77.05 g. The density is __

1. A 5.75 mL sample of mercury has a measured mass of 77.05 g. The density is ___________ 2. Mercury’s accepted density is 13.53 g·mL-1. The % error in your measurement is: ______…

1. A 5.88 kg piece of granite with a specific heat of 0.803 J g -1 °C -1 and a t

1. A 5.88 kg piece of granite with a specific heat of 0.803 J g-1 °C-1 and a temperature of 85.1 °C is placed into 2.00 L of water at 19.0 °C. When the granite and water come to t…

1. A 50.0 mL graduated cylinder has a mass of 63.8 g. When it is filled with an

1. A 50.0 mL graduated cylinder has a mass of 63.8 g. When it is filled with an unknown liquid to the 37.7 mL mark, the cylinder and liquid combined have a mass of 92.3 g. Calcula…

1. A 53.8 mg sample of sodium perchlorate contains radioactive chlorie-36 (whose

1. A 53.8 mg sample of sodium perchlorate contains radioactive chlorie-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the rem…

1. A 60% w/w solution of nicotine in water is heated from 22°C to 80°C. This pro

1. A 60% w/w solution of nicotine in water is heated from 22°C to 80°C.  This process is termed: isothermal isoplethal isocratic isobaric adiabatic 2. The nicotine concentrations …

1. A 72.1 ml sample of ethyl alcohol contains 14.6 grams of ethyl alcohol and 53

1. A 72.1 ml sample of ethyl alcohol contains 14.6 grams of ethyl alcohol and 53.6 grams of water. Ethyl alcohol has a molecular weight of 46.067 g/mol. Water has a density of 1.0…

1. A 750 ml, 0.5 solution of NaOh has a density of 1.7 g/mL.What is the mass per

1. A 750 ml, 0.5 solution of NaOh has a density of 1.7 g/mL.What is the mass percent of NaOh in the solution? also how do you solve for H?    ln(760/41) = H/8.3145 (1/(25+273) - 1…

1. A 88.3 g sample of metal at 95.24 o C is added to 35.10 g of water that is in

1. A 88.3 g sample of metal at 95.24 oC is added to 35.10 g of water that is initially at 17.27 oC. The final temperature of both the water and the metal is 29.20oC. The specific …

1. A 9.157 mol sample of methane gas is maintained in a 0.8013 L container at 30

1. A 9.157 mol sample of methane gas is maintained in a 0.8013 L container at 302.7 K. What is the pressure in atm calculated using the van der Waals' equation for CH4 gas under t…

1. A 90.0-kg astronaut is working on the engines of his ship, which is drfting t

1. A 90.0-kg astronaut is working on the engines of his ship, which is drfting through space with a constant velocity. The astronaut, wishing to get a better view of the Universe,…

1. A BSR instruction at address $80006 calls a subroutine located at address $80

1. A BSR instruction at address $80006 calls a subroutine located at address $80500. What address is pushed onto the stack? Note: Address A7 contains $6004. 2. If A5 contains 0001…

1. A CHE 100 student lost some residue before recording the final mass. How migh

1. A CHE 100 student lost some residue before recording the final mass. How might it affect th experimental oxygen percent? Reason. A CHE 100 student did not heat the sample enoug…

1. A CSTR and a PFR of equal volume (VCSTR = VPFR = V) are used to degrade a com

1. A CSTR and a PFR of equal volume (VCSTR = VPFR = V) are used to degrade a compound in a first-order manner under steady-state conditions. (a) If the CSTR gives a 80% degradatio…

1. A Cube\'s length was measured with a caliper to be 3.238cm and the mass of th

1. A Cube's length was measured with a caliper to be 3.238cm and the mass of the cube is 91.66g. A) How many significant figures you get when you read with this caliper? B) Calcul…

1. A Nd:YAG laser has an output power of 10mW at 1064nm. If the laser is not con

1. A Nd:YAG laser has an output power of 10mW at 1064nm. If the laser is not continuous but operates in pulsed mode with the same output power and same size, and the pulse duratio…

1. A Phillips antacid tablet, weighing 0.5729 g, was dissolved and diluted to 25

1. A Phillips antacid tablet, weighing 0.5729 g, was dissolved and diluted to 250.00 mL using the procedures described on p. 66 of your lab manual (see item 1). The resulting solu…

1. A Student has run as electrolysis reaction of an aqueous solution of MgBr2 (a

1. A Student has run as electrolysis reaction of an aqueous solution of MgBr2 (aq) in a petri dish using inert electrodes and a 9v battery. Observations are made and the following…

1. A Wavelength:470nm Mass of unopened packet 1 5.255g Mass of emptied packet 1

1. A Wavelength:470nm Mass of unopened packet 1          5.255g Mass of emptied packet 1           1.358g Mass of mix1 transferred            3.897g Volume of stock solution 1    …

1. A \"coffee-cup\" calorimetry experiment is run for the dissolution of 2.5 g o

1. A "coffee-cup" calorimetry experiment is run for the dissolution of 2.5 g of lithium nitrate placed into 97.2 mL of water. The temperature of the solution is initially at 23.5 …

1. A \"coffee-cup\" calorimetry experiment is run for the dissolution of 2.5 g o

1. A "coffee-cup" calorimetry experiment is run for the dissolution of 2.5 g of lithium nitrate placed into 97.2 mL of water. The temperature of the solution is initially at 23.5 …

1. A balance is checked and found to be accurate and clean. After the lab, a spi

1. A balance is checked and found to be accurate and clean. After the lab, a spilled white solid is found on the balance. The only white substances available in the lab were bariu…

1. A balloon is filled with He gas to a volume of 2.10 L at 35 °C. The balloon i

1. A balloon is filled with He gas to a volume of 2.10 L at 35 °C. The balloon is placed in liquid nitrogen until its temperature reaches –196 °C. Assuming the pressure remains co…

1. A balloon is floating around outside your window. The temperature outside is

1. A balloon is floating around outside your window. The temperature outside is -15 C , and the air pressure is 0.800 atm . Your neighbor, who released the balloon, tells you that…

1. A battery is constructed from these two half reactions: not balanced CCr not

1. A battery is constructed from these two half reactions: not balanced CCr not balanced) CIO: (g) E 1.33 Vvs SHE B 0.954 V CO (a) (1 pts) Balance each halfreaction. Assume acid s…

1. A beaker contains 25.0 mL of 0.80 M propylamine (C3H2NH2; KB=5.1 X 10^-4). a.

1. A beaker contains 25.0 mL of 0.80 M propylamine (C3H2NH2; KB=5.1 X 10^-4). a. Is propylamine classified as a weak or strong,acid or base? Write the equation showing the equilib…

1. A beaker with 2.00×102 mL of an acetic acid buffer with a pH of 5.000 is sitt

1. A beaker with 2.00×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A stude…